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  Electron emission display and a method of driving the electron emission displayUSPTO Application #: 20060139249Title: Electron emission display and a method of driving the electron emission display Abstract: An electron emission display includes: cathode electrode lines electrically connected to electron emission sources; gate electrode lines including openings corresponding to the electron emission sources, the openings being arranged at intersections of the gate electrode lines and the cathode electrode lines; phosphor cells arranged to correspond to the openings of the gate electrode lines; and a positive plate adapted to receive a voltage and to move electrons emitted from the electron emission sources to the phosphor cells in accordance with the received voltage. Scanning pulses, having gradually rising voltages, are sequentially supplied to the gate electrode lines in a unit frame, such that reference voltages of the gate electrode lines gradually rise in proportion to relative distances between the gate electrode lines and driving terminals of the cathode electrode lines. (end of abstract) Agent: Robert E. Bushnell - Washington, DC, US Inventor: Mun-Seok Kang USPTO Applicaton #: 20060139249 - Class: 345075200 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060139249. Brief Patent Description - Full Patent Description - Patent Application Claims
CLAIM OF PRIORITY [0001] This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. .sctn.119 from an application for ELECTRON EMISSION DISPLAY APPARATUS WHEREIN REFERENCE ELECTRICAL POTENTIAL OF SCANNING ELECTRODE LINES VARIES earlier filled in the Korean Intellectual Property Office on 23 Dec. 2004 and there duly assigned Serial No. 10-2004-0111099. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an electron emission display and a method of driving the electron emission display, and, more particularly, to an electron emission display including cathode electrode lines, gate electrode lines, phosphor cells, and a positive plate, and a method of driving the electron emission display. [0004] 2. Description of the Related Art [0005] An electron emission display is discussed in U.S. Patent Publication No. 2003/0122118, entitled "FED Driving Method", published on Jul. 3, 2003. The electron emission display includes cathode electrode lines, gate electrode lines, phosphor cells, and a positive plate. The cathode electrode lines are electrically connected to electrode emission sources. In the gate electrode lines, openings corresponding to the electrode emission sources are formed at portions where the gate electrode lines intersect the cathode electrode lines. The phosphor cells are formed to correspond to the openings of the gate electrode lines. A voltage is supplied to the positive plate to move electrons emitted from the electron emission sources to the phosphor cells. The gate electrode lines are used as scanning electrode lines and the cathode electrode lines are used as data electrode lines. [0006] In such an electron emission display, the cathode electrode lines used as data electrode lines have an internal resistance. Accordingly, pixels disposed far from driving terminals for driving the cathode electrode lines used as data electrode lines have lowered brightness, which deteriorates image reproducibility. SUMMARY OF THE INVENTION [0007] The present invention provides an electron emission display which enhances image reproducibility by efficiently compensating for brightness deviations due to the internal resistance of cathode electrode lines, and a method of driving the electron emission display. [0008] According to one aspect of the present invention, an electron emission display is provided including cathode electron lines, gate electron lines, phosphor cells, and a positive plate. The cathode electrode lines are electrically connected to electron emission sources. Openings corresponding to the electron emission sources are formed in the gate electrode lines at portions where the gate electrode lines intersect the cathode electrode lines. The phosphor cells are formed to correspond to the openings in the gate electrode lines. A voltage is supplied to the positive plate N to move electrons emitted from the electron emission sources to the phosphor cells. Scanning pulses, whose voltages gradually rise, are sequentially supplied to the gate electrode lines in a unit frame, such that reference voltages of the gate electrode lines gradually rise in proportion to the relative distances between the gate electrode lines and driving terminals of the cathode electrode lines. [0009] An average reference voltage of the gate electrode lines is preferably inversely proportional to an average gray-scale level of each frame. [0010] A reference voltage of the cathode electrode lines is preferably constant. [0011] Data pulses falling to a reference voltage of the cathode electrode lines from a bias voltage higher than the reference voltage of the cathode electrode lines are preferably supplied to the cathode electrode lines during a scanning pulse being supplied to one of the gate electrode lines. [0012] A reference voltage of a gate electrode line nearest the driving terminals of the cathode electrode lines is preferably higher than the reference voltage of the cathode electrode lines. [0013] A width of each of the data pulses preferably changes in proportion to a display gray-scale level. [0014] A positive voltage higher than a maximum voltage of the scanning pulses is preferably supplied to the positive plate. [0015] According to another aspect of the present invention, a method of driving an electron emission display is provided, the method comprising: electrically connecting cathode electrode lines to electron emission sources; arranging openings in gate electrode lines corresponding to the electron emission sources, the openings being arranged at intersections of the gate electrode lines and the cathode electrode lines; arranging phosphor cells to correspond to the openings of the gate electrode lines; and inputting a voltage to a positive plate to move electrons emitted from the electron emission sources to the phosphor cells in accordance with the received voltage; sequentially supplying scanning pulses, having gradually rising voltages, to the gate electrode lines in a unit frame, wherein reference voltages of the gate electrode lines gradually rise in proportion to relative distances between the gate electrode lines and driving terminals of the cathode electrode lines. [0016] An average reference voltage of the gate electrode lines is preferably inversely proportional to an average gray-scale level of each frame. [0017] A reference voltage of the cathode electrode lines is preferably constant. [0018] The method preferably further includes supplying data pulses falling to a reference voltage of the cathode electrode lines from a bias voltage higher than the reference voltage of the cathode electrode lines to the cathode electrode lines during a scanning pulse being supplied to one of the gate electrode lines. [0019] A reference voltage of a gate electrode line nearest the driving terminals of the cathode electrode lines is preferably higher than the reference voltage of the cathode electrode lines. [0020] A width of each of the data pulses preferably changes in proportion to a display gray-scale level. [0021] The method preferably further includes supplying a positive voltage higher than a maximum voltage of the scanning pulses to the positive plate. 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